I managed to source a pair of E30 M3 rear springs from FAB but I can't remember the length and no longer have the car to check. These worked fine, however I also gained as much "upwards" adjustment as possible on the upper spring seats as follows - Cut off half the thickness from the big nut on top of the spring seat, fit without a lock-nut and screw all the way up. Also need to cut a length off the large threaded stud that the upper spring seat locates on to allow the rubber seat to fit properly (it pokes too far through otherwise)
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